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Pro Forma Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended		1 Months Ended		9 Months Ended
	Apr. 30, 2014	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2014 property	Sep. 30, 2013	Sep. 30, 2014 Acquisition Senior living communities property	Jul. 31, 2014 Acquisition Senior living communities property	Sep. 30, 2014 Acquisition Senior living communities property	Sep. 30, 2014 Senior unsecured notes 3.25%	Sep. 30, 2014 Senior unsecured notes 4.75%
Pro Forma Information
Number of properties acquired				2		1	1	2
Aggregate purchase price properties, excluding closing costs				$ 1,158,078
Common shares issued in public offering	15,525,000		15,525,000
Net proceeds after underwriting discounts from issuance of common shares issued in public offering	323,318		323,318	322,962	261,813
Face Amount									400,000	250,000
Interest rate (as a percent)		1.55%		1.55%					3.25%	4.75%
Net proceeds after underwriting discounts from sale of senior unsecured notes		644,889
Pro forma results of operations
Total revenues				649,949
Net income				$ 110,583
Net income per share(in dollars per share)				$ 0.54

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